[Solved] You wrote this code to subscribe to Redis messages but your Django app freezes. What is the likely problem? import redis r = redis.Redis() pubsub = r.pubsub() pubsub.... | Django

Django - Celery and Background Tasks

You wrote this code to subscribe to Redis messages but your Django app freezes. What is the likely problem?

import redis

r = redis.Redis()

pubsub = r.pubsub()
pubsub.subscribe('notifications')

for message in pubsub.listen():
    print(message)

AThe subscribe() method is missing a callback function

BThe print statement syntax is incorrect

CRedis server is not running, causing freeze

DThe listen() loop blocks the main thread, freezing the app

Step-by-Step Solution

Solution:

Step 1: Analyze the listen() method behavior
The listen() method blocks and waits for messages, running an infinite loop.
Step 2: Understand impact on Django app
Running this loop in the main thread freezes the app because it never returns control.
Final Answer:
The listen() loop blocks the main thread, freezing the app -> Option D
Quick Check:
Blocking listen() causes freeze [OK]

Quick Trick: Run listen() in background thread to avoid blocking [OK]

Common Mistakes:

MISTAKES

Master "Celery and Background Tasks" in Django

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You wrote this code to subscribe to Redis messages but your Django app freezes. What is the likely problem?